Semiconductor integrated circuit with selective read and write i

Details Semiconductor integrated circuit with selective read and write i Semiconductor integrated circuit with selective read and write i

1989-12-14

1992-03-17

Popek, Joseph A.

Static information storage and retrieval

Read/write circuit

Signals

36518907, 365228, 364DIG1, 395425, 395775, G11C 700, G06F 738, G06F 1100

Patent

active

050974459

ABSTRACT:
A semiconductor integrated circuit with a non-volatile memory capable of electric rewriting of data is disclosed. The circuit is provided with inhibiting means for comparing an address of a write inhibition area of the non-volatile memory and an address from an external or internal CPU and inhibiting the writing of data in the area when the two compared addresses coincide, and also comparing an address of a read inhibition area of the non-volatile memory and an address from an external reader/writer and inhibiting the reading of data from the area when the two compared addresses coincide. It is thus possible to prevent erroneous rewriting of a program or protection-required data due to runaway of CPU and also prevent reading of secret data by a third party. Thus, a microcomputer can be realized, in which a program memory and a data memory both consist of non-volatile memories capable of rewriting of data, and which is very easy to use and has improved reliability and confidential property.

REFERENCES:
patent: 3573855 (1971-04-01), Cragon et al.
patent: 3742458 (1973-06-01), Inoue et al.
patent: 4701886 (1987-10-01), Sakakibara et al.
patent: 4796232 (1989-01-01), House
patent: 4931997 (1990-06-01), Mitsuishi et al.
patent: 4975878 (1990-12-01), Boddu et al.
Motorola 8bit MCU Family Products Guide ('87).

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